Help Needed: Error in Real-Time Data Acquisition Using I2C on BeagleBone Black

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/i2c-dev.h>

int main()
{
    int file;
    char filename[40];
    int addr = 0x68; // I2C device address

    snprintf(filename, sizeof(filename), "/dev/i2c-1"); // I2C bus
    file = open(filename, O_RDWR);
    if (file < 0) {
        printf("Failed to open the I2C bus\n");
        return 1;
    }

    if (ioctl(file, I2C_SLAVE, addr) < 0) {
        printf("Failed to acquire bus access and/or talk to slave\n");
        return 1;
    }

    // Code to communicate with the I2C device and acquire real-time data

    close(file);
    return 0;
}